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9.3

Checking if an item already exists in listbox

Asked by lolwtf in Microsoft Visual Basic.Net, Microsoft Programming

Tags: VB.NET, Microsoft

Hi experts,

I have a form with a textbox and a listbox next to each other.  You can scan a barcode on a badge, and the ID number will show up in the textbox, then put it in the listbox.  The idea is to create a attendance program for employees.  What I want to do is check the listbox to see if a person is checked in or not, and display a message.  I have some code written so far, but I got stuck.  Can you see if I'm on the right track?   
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Dim DSScan As New DataSet
 
Try
 
            If txtScan.TextLength = 9 Then
                DBASchool.SelectCommand.CommandText = "SELECT StudentID, FName, LName FROM tblStudent WHERE StudentID = '" + txtScan.Text + "'"
                DBASchool.Fill(DSScan)
                lstAttendance.Items.Add(DSScan.Tables(0).Rows(0).Item("FName").ToString + " " + DSScan.Tables(0).Rows(0).Item("LName").ToString)
                txtScan.Text = ""
                Label3.Visible = False
 
            ElseIf lstAttendance.Items.Contains() = True Then
                MessageBox.Show("Student already checked in", "Info", MessageBoxButtons.OK, MessageBoxIcon.Information)
                txtScan.Text = ""
            End If
 
        Catch ex As Exception
            Label3.Visible = True
            Console.Beep()
 
        End Try
[+][-]10/01/09 12:51 PM, ID: 25472538Accepted Solution

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About this solution

Zones: Microsoft Visual Basic.Net, Microsoft Programming
Tags: VB.NET, Microsoft
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Solution Provided By: daffyduck14mil
Participating Experts: 1
Solution Grade: A
 
 
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